20 minutes - 1 hour
Had a cracked digitizer (glass).
I watched the repair instructions first and took my tablet apart. Based upon those instructions, my model was exactly the same. I had it all apart before I ordered the complete digitizer/LCD/bezel replacement part so I was sure to complete the repair when the part arrived. The repair was easy since my model (1st gen) came with the bezel and LCD. Therefore, I didn't have to split the digitizer from the LCD. It was just a drop-in replacement.
Just pay attention, work carefully, take your time, and follow the online instructions exactly.